Multiphone.



PATENTED JULY 14, 1908.

K. TURNER. MULTIPHONE. APPLICATION FILED DBO. 21, 1905.

UNITED STATES PATENT OFFICE.

KELLEY M. TURNER, OF NEW YORK, N. Y.

, ASSIGNOR TO GENERAL ACOUSTIC COMPANY, A

CORPORATION OF NEW YORK.

MULTIPHONE Specification of Letters Patent.

Patented July 14, 1908.

Application filed December 21, 1905. Serial No 292,677.

To all whom it may coacem:

Be it known thatI, KELLEY ,M. TURNER, a

citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Multi phones, of which the following is a full, clear, and exact description.

The ob'ect of the invention is to collect all the 'audi le sounds within an auditorium and transmit the same over ordinary teleinvention.-

The ordinary telephone serves to transmit sounds received by it, but with a great reduction in the intensity thereof, so that not only is it necessary to originally direct the sounds closely into the transmitting instru ment, but the ear must be closely ap lied to the'receivin instrument in order t at the sound may e at all audible. It is evident that the ordinary telephone system is not adapted to be used for reproducing concerts,

theatrical performances, and the like, because in these cases it is im sounds to be closely directe into the transmitting instruments. It is still-further imractical on account of the inconvenience of.

istening tothe reproduction through an ordinary receiver applied to the since it necessitates receivin circuits for 'every person forwhomthe per ormance-is to be repeated.

By the present invention I overcome the defects and objectionable features above mentioned, and secure a reproduction of all the sounds within the original auditorium at a second point or auditorium where they may be heard and enjoyed by all the, persons congregated. Referring to the drawing, 1 denotes a ossible for theear, an ar-- rangement which 1s furthermore expensive,

transmitting instrument, and while it is possible that different forms of transmitting apparatus can be usedz; I have in my experiments been able to secure the most satisfactory results with,the form of transmitter set forth and shown in Letters Patent No. 874,004 and N0. 711,97 4. This transmitter, comprises a transmitting disk 2, with a series of circumferential openings 3 for the ad- .mission of sound. 'Pwo of these are assembled within a box, in which is also contained a battery which furnishes the necessary current. This transmitting box is laced at any desired receiving point, prefer: ly upon the stage of the auditorium, and directly behind thefoot lights thereof, so as to be concealed from the audience.

5 designates line wires passing through the floor of the stage in any inconspicuous way,

and led through'a line circuit 6 to the re ceiving point 7 a At the receiving point 7 I locate what 'I shall term a multiphone receiver which is ar ranged and constructed to reproduce the original sounds with, sufficient intensity to entirely fill and be heard in a second auditorium of reasonable size. receiver consists of a block or casing 8 1n the rear of which are inset a plurality of telephone receivers 9, all located in a multiple circuit with the line wires 6.

10 designates channels from the respective telephone receivers all directed into a common chamber 11, which forms the throat of a horn 12 directed into the receiving auditorium.

By the above This multiphone arrangement all the sounds spoken or produced upon the stage of the auditorium are collected in the transmitting box 1, and transmitted over the line so as to be reproducedin each of, the receivers 9. These act inexact concert with one another, being in perfect phase on account of their connection with the same line wire circuit. Inasmuch as the various channels 10 are of equal length and symmetrically laced, the sound passes forward in each wit the same speed, so that every wave or vibration ar- .r1ve's at the throat or chamber -11 at precis'ely the same instant. In this way the articulation and purity of the re reduced sound is perfectly vmaintained,'wh1 e at the portion to .the number of receivers use so that the sound can be easily heard throughsame time the intensity is augmented in roout a receiving auditbr'ium of any ordinary size.

5 connected in multiple,

a horn having a block with convergent passages, a, plurality of receivers in 1n :1 mult set in said passages and connected iple clrcult W1th said transnntters,

said transmitters being included in a box having a battery. I

In witness whereof, I subscribe my signature, in the presence of two witnesses. KELLEY M. TURNER.

Witnesses:

JOHN H. DEVLIN, H. W. HAFF. 

